Out of a sudden, my iPhoto showed the error message “The template you had selected ((null)) is no longer available. The default template has been selected.” whenever I switched from another application back to iPhoto. After a while, I figured out that this happens only after I triggered the export dialog. As I had installed several export plugins, it seemed quite likely that one of them was causing the problem. And indeed, the BetterHTMLExport export page mentioned “templates” and the drop-down for selecting the template was blank. After I selected “built-in” there once and pressed cancel, the error was gone.

Unfortunately, I could not figure out how to uninstall the BetterHTMLExport plugin…

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